Flashcards: Understanding Salt Solubility and Precipitation — 18 cartões

Todos os cartões

1Pergunta

Salts — composition?

Resposta

Formed from positive and negative ions.

2Pergunta

Solubility — definition?

Resposta

Max salt amount dissolvable in water at a specific T.

3Pergunta

Soluble salts — example?

Resposta

Sodium hydroxide, nitrates like silver nitrate.

4Pergunta

Insoluble salts — example?

Resposta

Calcium carbonate, barium sulfate.

5Pergunta

Solubility at 25 ºC — trend?

Resposta

Varies; generally increases with temperature.

6Pergunta

Precipitation reaction — process?

Resposta

Formation of insoluble salt from soluble reactants.

7Pergunta

Precipitate — definition?

Resposta

Poorly soluble solid formed during reactions.

8Pergunta

Chemical equation — example?

Resposta

Pb(NO₃)₂ + 2 KI → PbI₂ (s) + 2 NaNO₃.

9Pergunta

Solubility and temperature — effect?

Resposta

Most salts dissolve more as temperature rises.

10Pergunta

Exceptions — salts?

Resposta

Calcium carbonate decreases solubility with higher T.

11Pergunta

Natural precipitation — example?

Resposta

Stalactites formed from calcium carbonate deposits.

12Pergunta

Dissolution of calcium carbonate — role?

Resposta

Releases calcium bicarbonate into water.

13Pergunta

Recrystallization — process?

Resposta

Precipitation of calcium carbonate from calcium bicarbonate.

14Pergunta

Environmental impact — example?

Resposta

Acid rain dissolves limestone, forming caves.

15Pergunta

Formation of stalactites — mechanism?

Resposta

Precipitation of calcium carbonate from dripping water.

16Pergunta

Dissolution — reaction?

Resposta

Calcium carbonate + acid → calcium bicarbonate.

17Pergunta

Recrystallization — reaction?

Resposta

Calcium bicarbonate → calcium carbonate + CO₂.

18Pergunta

Effect of temperature on solubility — general?

Resposta

Usually increases, but some salts like calcium carbonate decrease.

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1. What does 'Sal Solubility' refer to?

2. Which salt's solubility decreases as temperature increases, contrary to the general trend?

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